Atlas and text-book of topographic and applied anatomy . de to re-establish the normal com-munication with the nasal cavity fromabove. The opening of the frontal sinusfrom without may lead to a subcutaneousemphysema of the frontal region, since the air from the nasal chambers gains access to thesubcutaneous tissues of the forehead. Large frontal sinuses frequently extend posteriorly intothe roof of the orbit. The severe pain attendant upon catarrhal inflammation of the frontalsinus is explained by the rich supply of the lining mucous membrane from the nasal nerve. The fontanelles are membranou
Atlas and text-book of topographic and applied anatomy . de to re-establish the normal com-munication with the nasal cavity fromabove. The opening of the frontal sinusfrom without may lead to a subcutaneousemphysema of the frontal region, since the air from the nasal chambers gains access to thesubcutaneous tissues of the forehead. Large frontal sinuses frequently extend posteriorly intothe roof of the orbit. The severe pain attendant upon catarrhal inflammation of the frontalsinus is explained by the rich supply of the lining mucous membrane from the nasal nerve. The fontanelles are membranous portions of the vertex of the fetus and of the newborn at thejunction of several bones where ossification takes place at a comparatively late date. We dis-tinguish two single and two paired fontanelles (see Fig. 5). The single fontanelles are the most important: 1. The large or frontal jontanelle.—This is diamond-shaped, and in the new-born is situatedbetween the still ununited halves of the frontal bone and the two parietal bones. Like the frontal. —The skull with the closed frontal sinuses exposed bychiseling away the outer table and the diploe. 20 TOPOGRAPHIC AND APPLIED ANATOMY. suture, it does not close until the second year, but may remain open for a much longer the birth of the child it is utilized by the obstetrician to determine the position of the The small or occipital jontanelle.—This has the shape of an obtuse-angled triangle andlies between the highest point of the occipital bone and the two parietal bones. During birththis fontanelle is usually closed, but the physician can nevertheless recognize it by the fact that thecompression of the childs skull pushes the occipital bone beneath the edges of the parietal paired fontanelles, less important and usually closed at birth, are:i. The anterolateral jontanelle, between the frontal and parietal bones on the one side andthe great wing of the sphenoid and the squamous portion of
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